namespace Oms.Application.Shared;

/// <summary>
/// 微信注册字段裁剪，避免超出库表长度触发保存失败。
/// </summary>
public static class WeChatRegistrationFieldNormalizer
{
    public const int CustomerNameMaxLength = 128;
    public const int PhoneMaxLength = 16;
    public const int EmailMaxLength = 64;
    /// <summary>客户表 WechatAvatar 列长度。</summary>
    public const int CustomerWechatAvatarMaxLength = 255;
    public const int NicknameMaxLength = 64;
    public const int OpenidMaxLength = 64;

    /// <summary>微信头像仅写入 t_customer；RBAC user.Avatar 列更短，注册时不写入。</summary>
    public static string? NormalizeCustomerWechatAvatar(string? avatar) =>
        TruncateOptional(avatar, CustomerWechatAvatarMaxLength);

    public static string TruncateRequired(string value, int maxLength)
    {
        var normalized = value.Trim();
        return normalized.Length <= maxLength ? normalized : normalized[..maxLength];
    }

    public static string? TruncateOptional(string? value, int maxLength)
    {
        var normalized = value?.Trim();
        if (string.IsNullOrWhiteSpace(normalized))
        {
            return null;
        }

        return normalized.Length <= maxLength ? normalized : normalized[..maxLength];
    }
}